654 
Mr. BlacRwall's Descriptions of new Species of Spiders. 
The male is rather smaller than the female, but resembles her in 
colour and in the relative length of his legs. He hasa large, obtuse pro- 
minence near the middle of the cephalo-thorax, between which and the 
anterior part, where the eyes are situated, there is a deep depression, 
thickly clad with strong hairs. The mandibles are provided with a small, 
conical protuberance in front, near their extremity. The fourth joint of 
the palpi, which is rather larger than the third, projects two minute, 
pointed apophyses from its extremity ; one situated in front, and the 
other, which is the smaller, on the inner side; fifth joint oval, convex and 
hairy externally, concave within, comprising the palpal organs; they are 
neither highly developed, nor very complicated in structure, a dark red- 
dish brown process, curved outwards, occurring at the upper part; their 
colour is yellowish brown, with a faint tinge of red. 
Specimens of this remarkable spider, in a state of maturity, were discovered 
under stones in a moist pasture at Oakland, in May 1838. 
40. Neriéne tuberosa. Mas saturatè brunneus; pedibus palpisque flavescenti- 
brunneis; cephalo-thorace prope medium gibboso; pedibus posterioribus 
anterioribus pauló longioribus. 
Length of the male 45th of an inch; length of cephalo-thorax I; breadth -L : 
breadth of abdomen 35; length of a posterior leg +; length of a leg of 
the third pair +5. 
Cephalo-thorax oval, glossy, gibbous near the middle, with slight furrows on 
the sides, diverging from the upper part towards the margins, and an 
indentation in the medial line of the posterior region. Mandibles strong, 
conical, armed with teeth on the inner surface, and a small, conical pro- 
tuberance in front, near the extremity; they are slightly inclined towards 
the sternum, which is broad and heart-shaped. Maxillæ inclined towards 
the lip, which is semicircular and prominent at the extremity. These 
parts are dark brown, the mandibles and maxillæ being the palest. Legs 
and palpi yellowish brown. Fourth pair of legs rather the longest, then 
the first, third pair the shortest. The intermediate eyes of the anterior 
row are the smallest of the eight. The fourth joint of the palpi, which is 
rather stronger than the third, projects two minute, pointed apophyses 
